Portal access device with removable sharps protection

ABSTRACT

A portal access device that is adapted to provide long term access to a port implanted in a patient has two major components, an infuser assembly and a safety needle insertion device. The infuser assembly has an infuser housing that can be configured into a specific shape, for example a dome. A blunt cannula is attached to and extends downwardly from the underside of the infuser housing. Also connected to the infuser housing, preferably at a side thereof, is a tubing or catheter. The safety needle inserter assembly has a base having a proximal portion that is configured to form fit over the infuser housing. At the distal portion of the base uprights are provided so that a second end of an arm, to which first end a needle or a sharp cannula is connected, may be movably and hingedly connected to the base. The sharp cannula extends from the underside of the proximal end of the arm and passes through the base by way of a bore formed at the proximal portion of the base. The bore is defined between an opening at the underside of the base and an opening at the upper surface of the base. Locking mechanisms are provided at the base uprights and the distal end of the arm so that when the arm is moved away from the base, and as the distal end of the arm pivots about the uprights, the respective locking mechanisms provided at the arm and the base would coact to lock the arm in place, to thereby maintain the tip of the needle within the bore formed in the base. To use, the safety needle inserter is placed over the infuser assembly, with the sharp cannula extending through the infuser housing and axially mating with the blunt cannula of the infuser assembly, but with the tip of the sharp cannula protruding beyond the tip of the blunt cannula. The combined needle inserter/infuser assembly is pressed down onto the skin surface of the patient so that the combination sharp/blunt cannulas penetrate the patient and puncture the self-sealing septum of a portal reservoir implanted in the patient. Once the safety needle inserter is removed from the infuser assembly, with the infuser housing septum being self-sealing, a closed fluid communication path is established between the portal reservoir and a fluid store that may be connected to the catheter of the infuser assembly. Long term access of the implanted portal reservoir is thereby achieved.

FIELD OF THE INVENTION

The present invention relates to a device for accessing a portal reservoir, and more particularly a portal access device that combines long term accessing of a portal reservoir with sharps protection.

BACKGROUND OF THE INVENTION

Long term intravenous therapy to a patient oftentimes requires that a portal reservoir (also may be referred herein as port or portal) be implanted to the patient. The medicament stored in the port is fed slowly to the patient via a catheter connected to the portal. To refill the portal, conventionally a needle is inserted through the skin of the patient into a septum of the portal so that the portal may be refilled with the desired medicament. As with the use of any needle or sharps instruments, there is always a chance that the user, or a bystander, may be accidentally pricked by the contaminated needle when it is removed from the patient. Such accidental injury may well be serious as the tip of the needle is contaminated with the fluid from the patient.

A prior device used for shielding the contaminated tip of the needle is disclosed in U.S. Pat. No. 6,613,015, assigned to the assignee of the instant application and marketed under the trade name GRIPPER PLUS. The disclosure of the '015 patent is incorporated by reference herein. In the '015 patent, a right angle needle for accessing the portal is disclosed. The '015 device has the horizontal portion of its right angle needle embedded in an arm that has a distal portion hingedly connected to uprights of a base. The vertical portion of the needle extends through an opening at the proximal portion of the base. Medicament or fluid is fed to the right angle needle via a catheter connected to the distal end of the horizontal portion of the needle. A well or catch is formed above the main body of the base adjacent the opening so that when the arm is pivotally raised relative to the base and when the of the needle is fully pulled out of the base, the tip of the needle would flex forward so as to be entrapped in the catch adjacent to the opening. Even though surrounded by a dam, the tip of the needle nonetheless is exposed to the environment and viewable by the patient, and there is a remote chance that contaminated fluid at the tip of the needle may adhere to the well, or may be splattered unnecessarily around the area of the well or beyond. A similar right angle device is disclosed in U.S. Pat. No. 6,719,721.

After accessing the portal and refilling it, the device of the '015 patent is removed from the skin of the patient. Any subsequent refilling of the portal requires that a new right angle needle device be used to gain access to the portal. This repeated insertion of a needle to the patient tends to cause discomfort, at the very least, to the patient.

There is therefore a need for a portal access device that may be secured to the patient on a long term basis so as not to subject the patient to repeated inserts by needle sharps.

There is also a need for a sharps protection device having the tip of its needle that, once removed from the patient, will not be exposed to the environment or seen by the patient.

SUMMARY OF THE PRESENT INVENTION

The portal access device of the instant invention comprises two main components that may or may not be preassembled prior to shipping. The first of these components incorporates a safety needle insertion device similar to the device disclosed in the above incorporated by referenced '015 patent, but with modifications. The second component is a low profile portal access assembly that includes an infuser or a cap, a blunt cannula extending downwardly from the infuser, and a flexible delivery tubing or catheter connected to the infuser for establishing a fluid path between the conduit and the blunt cannula. The blunt cannula, or at least a tip portion thereof, is to be piercingly coupled to the portal reservoir so that fluids, or medicaments, may be delivered to or removed from the portal reservoir by way of the infuser.

The main body of the infuser, or its cap or housing, is the portion of the component external to the patient and is meant to be positioned on or above the patient's skin surface, along with its attached tubing. The blunt cannula is attached to and extends downwardly from the infuser housing through the skin of the patient and the portal septum after placement, and establishes the fluid communication path between the external tubing of the infuser assembly and the portal reservoir implanted in the patient.

To be properly inserted to the patient, the needle sharps device is superposed, or fits, over the infuser in such a way that its needle or sharp cannula extends past the self sealing septum of the infuser, through the infuser, and axially into the blunt cannula, with the tip of the sharp cannula protruding or exposed from the end of the blunt cannula. The sharp cannula thereby serves as the means to puncture and penetrate first the patient and then the self sealing septum at the portal reservoir to provide a track for the coaxial blunt cannula. Once the sharp cannula and the blunt cannula, or at least corresponding portions of the respective tips thereof, are coaxially positioned correctly within the portal reservoir, the sharp cannula is removed from the blunt cannula. Once the sharp cannula is removed from the infuser assembly, the safety needle protection device may be removed from the infuser assembly. The tip of the needle or sharp cannula is fixedly maintained within a bore of the base of the needle insertion device that extends between the opening at the top surface and the opening at the lower surface of the base wherethrough the sharp cannula extends into the blunt cannula.

Respective locking mechanisms are provided at the end of the arm of the needle insertion device that connects to the base and the uprights at the base to which the arm is hingedly or pivotally connected to prevent the arm from further movement, be it upwards or downwards, relative to the base once the tip of the needle is positioned within the bore of the base. The sharps protection device may then be safely and properly discarded.

The infuser assembly remains on the patient, with the septum of the infuser where the sharp cannula entered and exited self-sealed. With proper attachment to the patient, either adhesively or by tape, the low profile infuser assembly provides long term access to the portal reservoir without further risks of sharps injury, or further unnecessary pain and discomfort, to the patient due to the need for reinsertions of sharp needles to the patient.

To hide the contaminated tip of the needle or the sharp cannula from the user and also the patient, the needle insertion device of the instant invention is configured such that when the tip of the contaminated needle is withdrawn first from the portal reservoir and then the patient, as soon as it is positioned appropriately in the bore formed in the base through which the sharp needle or cannula extends, the movement of the arm that bears the sharp cannula is stopped and locked into place, so that the tip of the needle would not come into contact with any part of the base, and is not withdrawn above the top surface, or the opening at the top surface, of the base. Locking mechanisms at the end of the arm that hingedly connects to the base and at the uprights to which the arm is hingedly attached cooperatively coact to prevent any further upward and downward movements of the arm, once the tip of the needle is appropriately positioned within the bore.

The lower surface of the base of the needle insertion device is configured to form fittingly mount over the infuser, both the infuser or cap portion and the tube connecting thereto that lie over the patient's skin surface, so that the needle injection device and the infuser may be pre-assembled as a unit.

A first aspect of the instant invention is a combination of an infuser, or a fluid storage housing or body, to which a blunt cannula is connected and to which a tube extends, so that the infuser establishes a fluid communication path between the blunt cannula and the tube. The combination further includes a sharp cannula that is removably mated to the blunt cannula through the infuser with the tip of the sharp cannula protruding or extruding beyond the tip of the blunt cannula. The sharp cannula is attached to a first end of a arm, a second end of which being movably connected to a distal portion of a base. The sharp cannula extends through an opening at a proximal portion of a base which is configured to fit over the infuser when the sharp cannula is mated to the blunt cannula. The sharp cannula is removable from the blunt cannula when the first end of the arm is moved in a direction away from the proximal portion of the base.

The invention also relates to an apparatus that comprises an infuser having a blunt cannula extending downwardly therefrom and a tube connected thereto for establishing a fluid communication path between the tube and the blunt cannula; and an insertion device that includes a base having a distal portion and a proximal portion, an arm having a second end hingedly and movably connected to the distal portion of the base, a sharp cannula attached to a first end of the arm, an opening provided at the proximal portion of the base, with the base covering the infuser and the sharp cannula removably mated to the blunt cannula through the opening at the proximal portion of the base, and the tip of the sharp cannula protruding or exposed beyond the tip of the blunt cannula when the arm lies substantially longitudinally along the base. The sharp cannula is removable from the blunt cannula when the first end of the arm is moved pivotally in a direction away from the base.

The invention further relates to a method of establishing a fluid path between a fluid store and a port or portal reservoir implanted in a patient. The method comprises the steps of: (a) providing a blunt cannula extending downwardly from an infuser and a tube having one end connected to the infuser and another end connected to a fluid store so that the tube is in fluid communication with the blunt cannula, (b) providing a base having a sharp cannula, (c) superposing the base over the infuser and removably mating the sharp cannula to the blunt cannula until the tip of the sharp cannula is exposed beyond the tip of the blunt cannula, (d) inserting the combined sharp and blunt cannulas to a patient to position the respective tips of the cannula into the port, and (e) removing the sharp cannula from the blunt cannula while leaving at least the tip of the blunt cannula in the port, so as to establish a fluid communication path between the port and the fluid store through the blunt cannula and the infuser.

The invention furthermore relates to an apparatus comprising an infuser housing adaptable for storing fluids, a blunt cannula extending downwardly from the housing, and a tube connected to a side of the housing for establishing a fluid path between the tube and the blunt cannula through the housing.

The needle insertion device of the instant invention relates to an apparatus that comprises a base having a distal portion and a proximal portion, a cannula attached to a first end of an arm, a second end of the arm hingedly connected to the distal portion of the base so that the arm is pivotable relative to the base at its second end, an opening provided at the proximal portion of the base wherethrough the cannula passes, a bore extending from the opening at the proximal portion of the base, a first lock mechanism or a first portion of a lock mechanism(s) provided at the distal portion of the base and a second lock mechanism or a second portion of a lock mechanism(s) provided at the second end of the arm, the first and second lock mechanisms coacting to prevent movement of the arm relative to the base after the tip of the cannula moves past the opening and is within the bore.

The needle insertion device of the instant invention is further a safety needle device that comprises a base having a distal portion and a proximal portion, an opening provided at the proximal portion of the base, a bore extending from the opening at the proximal portion of the base, an arm having a first end and a second end, the second end of the arm being hingedly connected to the distal portion of the base so that the arm is pivotally moveable relative to the base at its second end; and a right angle cannula mounted to the arm, a vertical portion of the cannula including the tip of the cannula extending downwardly from the first end of the arm and passes through the opening of the base before use, a horizontal portion of the cannula mounted along the length of the arm, so that when the first end of the arm is moved to its upmost position, the vertical portion of the cannula is withdrawn from the opening and the tip of the cannula is positioned within the bore.

The safety needle device of the instant invention may further include a first lock mechanism having a first and second part provided at the distal portion of the base, and a second lock mechanism having a first and second part provided at the second end of the arm with the respective first parts of the first and second lock mechanisms coacting to prevent further movement of the arm relative to the base along one direction after the tip of the cannula is positioned within the bore, and the respective second parts of the first and second lock mechanisms coacting to prevent further movement of the arm relative to the base along another direction once the tip of the cannula is positioned within the bore.

It is therefore an objective of the present invention to provide a portal access device that alleviates the need to reinsert a sharp cannula in the patient every time there is a need to either remove fluid from, or infuse fluid into, the portal reservoir implanted in the patient.

It is another objective of the present invention to provide a portal access device which needle insertion portion may be safely removed after the port has been accessed.

It is yet another objective of the present invention to provide a portal access device that allows a medical personnel to readily gain access to a portal reservoir implanted in a patient to clean out any obstruction that might occlude the flow of fluid into or out of the portal reservoir.

It is a further objective of the instant invention to provide a needle insertion device configured to prevent the tip of the contaminated needle or cannula from touching any part of the base of the device, and from being exposed to the environment or viewed by the patient or the user once the sharp cannula is withdrawn from the infuser portion of the portal access device.

BRIEF DESCRIPTION OF THE FIGURES

The present invention will become apparent and the invention itself will be best understood by reference to the following description of the present invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a perspective view of the safety needle inserter device of the instant invention;

FIG. 2 is a perspective view of a first embodiment of the safety needle inserter of the instant invention;

FIG. 3 is an enlarged view of the interconnection between the base and the arm of the safety needle inserter of the instant invention;

FIG. 4 is another view of the interconnection between the arm and the base of the safety needle inserter of the instant invention;

FIG. 5 is another embodiment of the safety needle inserter of the instant invention showing in particular the location of the tip of the needle, or sharp cannula, positioned within the bore of the base.

FIG. 6 is a side view of another embodiment of the safety needle inserter of the instant invention, with the arm of the inserter shown lying longitudinally along the base and the sharp cannula extending downwardly from the base;

FIG. 7 is another view of the safety needle inserter of the FIG. 6 embodiment showing the sharp cannula having been withdrawn from the opening of the base with the tip residing within the bore of the base and the arm having been pivoted upwardly relative to the base;

FIG. 8 is a front perspective view of the safety needle inserter of FIGS. 6 and 7, sans the sharp cannula, for showing the interrelationship between the locking mechanisms at the uprights of the base and the end of the arm hingedly connected to the uprights of the base;

FIG. 9 shows the portal access device of the instant invention in which the safety needle inserter component of the instant invention is superposed over an infuser assembly component of the instant invention;

FIG. 10 is a bottom view of the portal access device of the instant invention showing in particular the underside of the infuser and the safety needle inserter;

FIG. 11 a and FIG. 11 b show the sharp cannula of the safety needle inserter mated axially to the blunt cannula of the infuser and withdrawn from the infuser, respectively; and

FIG. 12 a and FIG. 12 b are respective views of the portal access device showing the mating of the sharp cannula to the blunt cannula and the removal of the sharp cannula from the blunt cannula, respectively.

DETAILED DESCRIPTION OF THE INVENTION

The first embodiment of the safety needle inserter device component of the instant invention is shown in FIGS. 1-4. As shown, the safety needle inserter 2 has a base 4 that has a distal portion 6 and a proximal portion 8. A foam pad or layer 10 coated with an adhesive for adhering base 4 to the patient may be mounted to the underside, or the lower surface, of base 4. An arm having a first end 14 and a second end 16 is hingedly connected to two uprights 18 a and 18 b, respectively, at distal portion 6 of base 4. Two lugs 19, one at each side of second end 16 of arm 12, are movably journaled to the respective guide holes 20 a and 20 b of the respective uprights 18 a and 18 b, to thereby hingedly and movably connect arm 12 to base 4. Only lug 19 a is shown in FIG. 2. When uplifted in the direction as indicated by directional arrow 22, arm 12 is pivotally moved, via its second end 16, in an upward direction relative to base 4.

A needle, or sharp cannula 24, is mounted to the underside of arm 12, at its first end 14. As shown in FIGS. 1 and 2, when arm 12 lies substantially longitudinally along the length of base 4, needle 24 extends downwardly from base 4 through an opening 44, best shown in the embodiment of FIG. 5. As shown, sharp cannula 24 has a tip 26 that is adapted to insert into the patient and penetrate the septum of a portal reservoir, or port, implanted to a patient. Note that even though the sharp cannula 24 of the safety needle inserter of the FIGS. 1-4 embodiment is a unitary needle mounted vertically from arm 12, a right angle needle that has a vertical portion and a horizontal portion embedded in arm 12 may also be used as the safety needle inserter of the instant invention. In the case where a right angle needle is used, the distal end of the horizontal portion of the right angle needle may be connected to a catheter, tube or tubing so that fluid may be conveyed to, or removed from, the sharp cannula 24. The sharp cannula may be usable singly, or coaxially with a blunt cannula of the to be discussed infuser component of the instant invention.

FIGS. 3 and 4 illustrate the locking mechanisms at the respective uprights 18 a and 18 b at distal portion 6 of base 4 and the corresponding coacting locking mechanisms formed at end 16 of arm 12 for preventing further movement of arm 12, once it has been pivotally moved relative to base 4 when tip 26 of sharp cannula 24 is positioned within a bore 42 formed in base 4, best illustrated in the embodiment of the safety needle inserter shown in FIG. 5. Although disclosed as different lock mechanisms, the different portions at both arm 12 and uprights 18 of base 4 may be considered as different parts of a single locking mechanism that cooperatively work together to lock arm 12 in place relative to base 4, and more importantly to fixedly maintain tip 26 of sharp cannula 24 within bore 42 formed at proximal portion 8 of base 4, so as to prevent tip 26 from being exposed or fluid thereon from being splattered, when sharp cannula 24 is withdrawn from the patient.

In particular, the lock mechanisms, or the portions of the lock mechanism, as shown in the FIGS. 3 and 4 embodiment, comprise a leg 28 and a boss 30 at the respective sides of end 16 of arm 12. The lock mechanisms, or the parts of the lock mechanism, at distal portion 6 of base 4 are configured as a shoulder 32 at upright 18 a and a groove or recess 34 at upright 18 b.

Due to the inherent elasticity in the medical plastics that are used for form molding the base and the arm of the safety needle insertion device, when arm 12 is moved along the direction indicated by directional arrow 22, the side surface 28 a of leg 28 would bias against the surface 32 a of leg 32, as boss 30 may or may not be sliding along surface 34 a of groove 34, so that once the foot 28 b of leg 28 passes ledge 32 b of shoulder 32, shoulder 32 will return to its original position so that latch 32 b and foot 28 b would bias or coact against each other to prevent any downward movement, as indicated by directional arrow 36, of arm 12. At substantially the same time, once boss 30 reaches groove 34 and biases thereagainst, further upward movement of arm 12 relative to base 4 is prevented.

To enable arm 12 to lie co-planarly on base 4, a notch 36 is provided on base 4 as a rest for boss 32. Further, a channel 38 is molded into base 4 to allow the downward extending portion 12 a of arm 12 to fit in alignment to base 4, when arm 12 is in the position vis-a-vis base 4 as shown in FIGS. 1 and 2. A void 40 is provided on base 4 to receive leg 28 of arm 12 so that arm 12 could lie substantially along base 4 as shown in FIGS. 1 and 2.

FIG. 5 is an illustration of a second embodiment of the safety needle inserter of the instant invention. Other than the overall look of the safety needle inserter and the various parts of the locking mechanisms which coact to lock arm 12 in place relative to base 4, the safety needle inserter of the FIG. 5 embodiment functions in the same way as the embodiment shown in FIGS. 1-4. The components that are the same as those of the earlier disclosed embodiment are labeled the same.

As shown more clearly by the partial cut-away view, the tip 26 of sharp cannula 24, when withdrawn from the portal reservoir and the patient, is maintained within a bore 42 that is formed at the proximal portion 8 of base 4. As shown, bore 42 is defined between opening 44 at the underside or lower surface of base 4 and an opening 44 a at the upper side or upper surface 46 of base 4. A dam 48 extends from proximal portion 8 of base 4 and serves as an additional safety feature to ensure that the tip 26 of cannula 24 could not be forcibly removed from bore 42. In addition, the top 48 a of dam 48 provides a rest stop for arm 12, with end 14 thereof resting against top surface 48 a, when needle 26 is axially fitted to the blunt cannula of the infuser. Dam 48 also provides a point for the needle inserter where a user can apply the force needed to insert the sharp cannula into the patient and, as will be described infra, penetrate the septum of the portal reservoir implanted to the patient. The same dam structure is provided in the earlier embodiment of the safety needle inserter.

The FIG. 5 embodiment of the safety needle inserter is different from the embodiment shown in FIGS. 1-4 in that instead of using separate components for preventing upward and downward movements of arm 12, a pair of bosses 50 provided at the end 16 of arm 12 would bias against the respective front faces 52 a of a pair of uprights 52 that are formed at the distal portion of base 4, to prevent further upward movement of arm 12 relative to base 4. A second pair of uprights 54 also extend from base 4 to grasp arm 12, when arm 12 lies longitudinally along base 4 with cannula 24 extending though opening 44. The holding of arm 12 by uprights 54 is by way of corresponding fingers 54 a and 54 b at the uprights 54. Since uprights 54, along with base 4 and arm 12, are all molded from medical plastics material, when arm 12 is moved upwardly per directional arrow 22, fingers 54 b of the uprights 54 would give away until end portion 16 of arm 12 passes both fingers 54 a and 54 b. At which time uprights 54 would return to their respective original positions so that the lower surface 16 a of end portion 16 of arm 12 would rest against the respective inclines 54 b of uprights 54, thereby preventing arm 12 from any downward movement as indicated per directional arrow 36.

A third embodiment of the safety needle inserter of the instant invention is shown in FIGS. 6-8. This embodiment is a modification of the simplified embodiment shown in FIG. 5 in that uprights 54 have been reconfigured to allow additional flexibility by the adding of a notch 56 thereto. As a consequence, when arm 12 is pulled upwards along the direction as indicated by directional arrow 22, each of uprights 54 would tend to flex away, until the underside 16 a of arm 12 clears the top edge 54 b of the respective uprights 54. At which time, uprights 54 will return to their respective memorized original positions so as to move upper surfaces 54 b of uprights 54 under the bottom surface 16 a of arm 12 and more specifically those surfaces of the bosses 52, or areas proximate thereto, to thereby prevent downward movement of arm 12 along the direction as indicated by directional arrow 36.

Further, similar to the embodiment shown in FIGS. 1-4, respective grooves or recesses 34 are provided at the uprights 52, so that bosses 52 are caught by the front surfaces of the respective recesses 34, designated by 34 a, so as to prevent arm 12 from any further upward movement as indicated by directional arrow 22. As before, even though not shown for the sake of clarity, the tip of needle 24 is fixedly retained within a bore at proximal portion 8 of base 4. Note that FIGS. 6-8 clearly show that arm 12 is hingedly connected to base 4 by way of its lugs 19 movably journaled to apertures 20 of uprights 52.

As with the other embodiments, a foam layer or pad 10 with an adhesive underside may be provided to the safety needle inserter for enhancing the comfort to the patient, when the inserter is used individually. However, as will be discussed infra, the fact that the safety needle inserter is a component of the overall portal access device of the instant invention, and its lower surface does not come into contact with the patient when used with the infuser component, foam 10 is not needed when the safety needle inserter is to be used with the infuser.

With reference to FIGS. 9-12, the portal access device of the instant invention is shown. In particular, a safety needle inserter 2 as described above is used in conjunction with an infuser or a low-profile portal access assembly 60 that includes an infuser body or housing 62, a blunt cannula 64 attached to the underside of body 62 and a catheter or tube 66 that is attached to a side of body 62. As shown in FIG. 9, infuser body 62 is formed as a domed shaped housing or a manifold that has a self-sealing septum 68 at its top in axial alignment with blunt cannula 64. Given that housing 68 is substantially hollow, infuser 60 in essence provides a fluid storage depot through which a communication path between tube 66 and blunt cannula 64 is established.

In operation, tube 66 is connected to a fluid store 70, which may be a syringe or a pump or some other storage device that is adapted for storing fluids or medicaments to be infused to the patient. Alternatively, instead of infusing fluid to the patient, or more particularly to the portal reservoir which is punctured by blunt cannula 64, fluid in the portal reservoir may be retrieved by means of the fluid communication path established between blunt cannula 64 and tube 66 via infuser body 62.

The safety needle inserter component of the portal access device of the instant invention, for the FIG. 9 embodiment, has its proximal portion configured as a dome 72 so that it may be form fitted over infuser body 62. Of course, infuser body 62 may have different dimensions and be configured as different shapes, for example a rectangular shaped housing. In which case, the proximal portion of base 4 of the safety needle inserter would also be rectangularly shaped so that it may form fit over the hypothetical rectangular shaped infuser body. Further, the remainder portion of base 4 may be configured to fit over tube 66, by having a channel 74 formed at its underside as shown by the bottom view of the safety needle inserter in FIG. 10.

The operation of the safety needle inserter component of the portal access device as shown in FIGS. 9 and 10 is the same as that discussed earlier with respect to the various embodiments of the safety needle inserter. When used with infuser assembly 60, safety needle inserter 2 is placed over infuser assembly 60 so that needle or sharp cannula 24 of the needle insertion device 2 is inserted through septum 68 into infuser body 62 and axially through blunt cannula 64 until the tip 26 of sharp cannula 24 protrudes or is exposed beyond the tip 64 a of blunt cannula 64. By configuring the proximal portion of needle inserter 2 to form fit over the infuser housing 62, and with arm 12, in particular proximal portion 14 thereof, resting on dam 48 of base 4, a user can readily insert the combination blunt cannula 64/sharp cannula 24 into a patient, designated by 74 in FIGS. 11 and 12, so that the tip 26 of cannula 24 may be inserted through a septum opening 36 of a port or portal reservoir 78 implanted in patient 74, per shown in FIGS. 11 a and 12 a. A window 80 may be formed at the proximal portion 8 of base 4 to enable the user to confirm that the dome 72 of the safety needle inserter 2 is appropriately form fitted over infuser body 62, to thereby ensure that cannula 24 be inserted correctly into infuser body 62 and through blunt cannula 64.

Once it is determined that portal reservoir 78 has been properly punctured and connected to infuser body 62 by way of the concentric blunt/sharp cannulas, the safety needle inserter may be removed from the infuser assembly by lifting arm 12 of the needle inserter relative to its base 4, per shown in FIGS. 11 b and 12 b. Once tip 24 of needle 24 is positioned within the bore of the base, with the respective lock mechanisms coacting at the arm and the base, arm 12 is prevented from further movement both upwardly and downwardly relative to base 4, as per discussion supra, so that tip 26 of needle 24 is fixedly maintained or positioned within the bore 42 formed in base 4.

Once arm 12 is locked into place, with tip 26 of the needle 24 properly positioned within bore 42 of base 4, the safety needle inserter may be removed from infuser assembly 60. To ensure that infuser body 62 and tube 66 would remain in place while needle inserter 2 is being removed, infuser body 62 may be provided with a pair of wings 82, either by bonding or molding, so that the user can hold wings 82 against the body or the skin surface of the patient, while lifting safety needle inserter 2 away from infuser assembly 60.

After removal of the safety needle inserter 2, infuser assembly 60 may be secured to the skin surface of the patient, by an adhesive layer preformed at the underside of infuser body 62 or an adhesive tape for example, so that a fluid communication path is continuously established between the portal reservoir 78 implanted in the patient and the fluid store 70. As a consequence, medicaments and other fluids are easily and readily infused to the patient through portal reservoir 78 and its associated catheter or tubing 79. Moreover, infuser assembly 60 provides a long term access to the portal reservoir 78 without further risks of sharps injury, as the safety needle inserter 2 has been removed and no further reinsertion is needed. Furthermore, given that the cannula 64 for infuser assembly 60 is a blunt cannula, when the infuser assembly is removed, there is no risk of injury to the patient or the user, and therefore no sharps protection is required.

Yet furthermore, given that septum 68 of the infuser assembly is self-sealing, infuser assembly 60 may be re-accessed through the self-sealing septum 68, either to provide direct coaxial access to the chamber of the portal reservoir 78, or access to the portal outlet catheter 79, for example by a radially flexible and axially stiff (pushable) wire or rod so that the fluid communication path may be threaded or rodded to clear any obstructions that may have occurred in either the portal reservoir or catheter 79 connected to the portal reservoir though which the medicament is fed to the patient.

Moreover, if a particular type of medicament is required, instead of providing the medicament through the fluid store 70, which feeds to tube 66 of the infuser assembly, a right angle needle insertion device such as that described earlier, or as disclosed in the above-discussed '015 patent, may be used to directly access the internal chamber of the portal reservoir, either via the blunt cannula of the infuser assembly or separate from the infuser assembly, so that the particular fluid may be fed through the catheter or tubing connected to the horizontal portion of the right angle needle directly into the portal reservoir. Also, the removal of fluid from the portal reservoir may be effected in the reverse manner by suctioning the fluid in the portal reservoir through a right angle needle inserter, by applying suction to the catheter connected to the horizontal portion of the right angle needle while the vertical portion of the right angle needle is in fluid communication with the partial reservoir. 

1. In combination, a blunt cannula, an infuser to which said blunt cannula is connected, a tube extending from said infuser, said infuser establishing a fluid communication path between said blunt cannula and said tube, a sharp cannula removably mated to said blunt cannula through said infuser with the tip of said sharp cannula exposed beyond the tip of said blunt cannula, said sharp cannula attached to a first end of an arm, a second end of said arm movably connected to a distal portion of a base, said sharp cannula extending through an opening at a proximal portion of said base, the proximal portion of said base configured to fit over said infuser when said sharp cannula is mated to said blunt cannula, said sharp cannula removed from said blunt cannula when the first end of said arm is moved in a direction away from the proximal portion of said base.
 2. Combination of claim 1, wherein said base comprises a body having a bore extending from said opening at its proximal portion through which said sharp cannula passes, wherein after the first end of said arm is fully moved to its upmost position, the tip of said sharp cannula is positioned within said bore.
 3. Combination of claim 1, wherein said base comprises at its distal portion one part of a lock mechanism and wherein said arm comprises at its second end an other part of said lock mechanism, said one and other parts coacting to prevent further movement of said arm relative to said base after the first end of said arm has been moved to its upmost position relative to said base to thereby fixedly maintain the tip of said sharp cannula within said bore.
 4. Combination of claim 1, further comprising a septum provide on said infuser through which said sharp cannula passes when said sharp cannula is mated to said blunt cannula, said septum sealing said infuser when said sharp cannula is removed from said infuser.
 5. Combination of claim 1, wherein said infuser comprises a housing having an aperture at its top in longitudinal alignment with said blunt cannula, a septum at said aperture to seal said housing, wherein said sharp cannula mates to said blunt cannula through said septumed aperture, and wherein said infuser has a lower surface adapted to lie substantially flat against the skin of a patient where the blunt cannula is inserted to the patient.
 6. Combination of claim 1, wherein the proximal portion of said base comprises a dome that covers said infuser when said sharp cannula is mated to said blunt cannula.
 7. Combination of claim 5, further comprising at least one wing provided at said infuser to enable a user to maintain said infuser against the skin of the patient as said sharp cannula is removed from said blunt cannula or when said base is separated from said infuser.
 8. Combination of claim 1, further comprising a port implanted in the patient, said port pierceable by said sharp cannula to position at least a portion of said blunt cannula in said port, the portion of said blunt cannula remaining inside said port after the removal of said sharp cannula from said blunt cannula so that a fluid path is established between said port and said tube through said infuser.
 9. Apparatus comprising: an infuser having a blunt cannula extending downwardly therefrom and a tube connected thereto for establishing a fluid communication path between said tube and said blunt cannula; a base having a distal portion and a proximal portion, an arm having a second end hingedly and movably connected to the distal portion of said base, a sharp cannula attached to a first end of said arm, an opening provided at the proximal portion of said base, said base covering said infuser with said sharp cannula removably mated to said blunt cannula through said opening at the proximal portion of said base and the tip of said sharp cannula exposed beyond the tip of said blunt cannula when said arm lies substantially longitudinally along said base; wherein said sharp cannula is removed from said blunt cannula when said first end of said arm is moved pivotally in a direction away from said base.
 10. Apparatus of claim 9, wherein said base comprises a body having a bore extending from said opening at its proximal portion through which said sharp cannula passes, said arm being pivoted at its second end to remove said sharp cannula from said blunt cannula, the tip of said sharp cannula being positioned within said bore after said sharp cannula is removed from said blunt cannula and said infuser, said base being separable from said infuser after said sharp cannula is removed from said infuser.
 11. Apparatus of claim 9, wherein said base comprises at its distal portion one part of a lock mechanism and wherein said arm comprises at its second end an other part of said lock mechanism, said one and other parts coacting to prevent further movement of said arm relative to said base after said sharp cannula has been removed from said infuser.
 12. Apparatus of claim 9, further comprising a septum provide on said infuser through which said sharp cannula passes when said sharp cannula is mated to said blunt cannula, said septum sealing said infuser when said sharp cannula is removed from said infuser.
 13. Apparatus of claim 9, wherein said infuser comprises a housing having an aperture at its top in longitudinal alignment with said blunt cannula, a septum at said aperture to seal said housing, wherein said sharp cannula mates to said blunt cannula through said septumed aperture, and wherein said infuser has a lower surface adapted to lie substantially flat against the skin of a patient where the blunt cannula is inserted to the patient.
 14. Apparatus of claim 1, wherein the proximal portion of said base comprises a dome that covers said infuser when said sharp cannula is mated to said blunt cannula.
 15. Apparatus for establishing fluid communication to a port implanted to a patient, comprising: an infuser having a blunt cannula extending downwardly therefrom and a tube connected thereto for establishing a fluid communication path between said tube and said blunt cannula; a base having a sharp cannula, said base superposed over said infuser, said sharp cannula removably mated to said blunt cannula with the tip of said sharp cannula exposed beyond the tip of said blunt cannula; wherein said sharp cannula is removed from said blunt cannula after the combined sharp and blunt cannulas were inserted to the patient to position said cannulas in said port, said blunt cannula remaining positioned in said port to establish a fluid communication path from said infuser to said port via said blunt cannula.
 16. Apparatus of claim 15, wherein said base comprises a body having a distal portion and a proximal portion, an arm having a second end hingedly connected to the distal portion of said base, said sharp cannula attached to a first end of said arm, an opening provided at the proximal portion of said base through which said sharp cannula is removably mated to said blunt cannula, the proximal portion of said base being configured to cover said infuser, a bore extending from said opening at the proximal portion of said body, said sharp cannula being removed from said blunt cannula when said arm is pivoted at its second end to raise the second end of said arm away from said body, the tip of said sharp cannula being positioned within said bore once said sharp cannula is removed from said infuser.
 17. Apparatus of claim 15, wherein said base comprises at its distal portion one part of a lock mechanism and wherein said arm comprises at its second end an other part of said lock mechanism, said one and other parts coacting to prevent further movement of said arm relative to said base after the tip of said sharp cannula has been removed from said infuser.
 18. Apparatus of claim 15, wherein said infuser comprises a housing having an aperture at its top in longitudinal alignment with said blunt cannula, a septum at said aperture to seal said housing, wherein said sharp cannula mates to said blunt cannula through said aperture, said septum sealing said infuser after said sharp cannula is removed from said infuser.
 19. A method of establishing a fluid path between a fluid store and a port implanted in a patient, comprising the steps of: a) providing an infuser having a blunt cannula extending downwardly therefrom and a tube having one end connected thereto and another end connected to said fluid store, said tube being in fluid communication with said blunt cannula; b) providing a base having a sharp cannula; c) superposing said base over said infuser and removably mating said sharp cannula to said blunt cannula until the tip of said sharp cannula is exposed beyond the tip of said blunt cannula; d) inserting the combined sharp and blunt cannulas to the patient to position said cannulas into said port; and e) removing said sharp cannula from said blunt cannula while leaving said blunt cannula in said port; whereby a fluid communication path is established between said port and said fluid store through said blunt cannula and said infuser.
 20. Method of claim 19, wherein said base comprises a body having a distal portion and a proximal portion, said step b further comprising the steps of: hingedly connecting a second end of an arm to the distal portion of said base; attaching said sharp cannula to a first end of said arm; providing an opening at the proximal portion of said body through which said sharp cannula is removably mated to said blunt cannula; and providing a bore extending from said opening at the proximal portion of said body.
 21. Method of claim 20, wherein said step e further comprises the step of: maintaining the tip of said sharp cannula within said bore once said sharp cannula is removed from said infuser.
 22. Method of claim 21, further comprising the step of: providing respective coacting parts of a locking mechanism at the distal portion of said body and the second end of said arm to prevent said arm and said body from further movement relative to each other once the tip of said cannula is positioned within said bore.
 23. Method of claim 19, wherein said infuser comprises a housing, the method further comprising the steps of: providing an aperture on the top of said housing in longitudinal alignment with said blunt cannula, said sharp cannula mating to said blunt cannula through said aperture; adding a septum to said aperture to seal said housing after said sharp cannula is removed from said infuser.
 24. Method of claim 23, further comprising the steps of: configuring the proximal portion of said base to cover said housing; and configuring the distal portion of said base to cover said tube.
 25. Apparatus comprising an infuser housing adaptable for storing fluids, a blunt cannula extending downwardly from said housing adapted to be inserted into a port, and a tube connected to a side of said housing, a fluid path being established between said tube and said blunt cannula through said housing.
 26. Apparatus of claim 25, further comprising a septum provided at the top of said housing in axial alignment with said blunt cannula, said septum adaptable to enable a sharp cannula to be inserted therethrough to mate axially within said blunt cannula, with the tip of said sharp cannula protruding from the tip of said blunt cannula, said septum self sealing once said sharp cannula is removed therefrom to maintain the fluid path between said blunt cannula and said tubing as closed fluid path. 